棉田免耕套栽油菜施肥效果及肥料适宜用量研究

Effect of NPK fertilization on rapeseed and optimal rate of fertilizer for interplanting rapeseed of no-tillage cotton-rapeseed rotation system

在棉田免耕套栽条件下,研究了油菜氮磷钾(NPK)肥施用效果及肥料适宜用量。结果表明,合理施用氮磷钾肥促进了油菜的营养生长和生殖生长,从而显著提高了油菜的产量和经济效益,N、P、K三要素增产效果依次为:N>P>K。通过对肥料效应模型的筛选,得出在试验条件下,油菜氮(N)、磷(P2O5)、钾(K2O)的适宜推荐用量分别为205kg/hm2、76kg/hm2、35kg/hm2。

A field experiment was conducted on interplanting rapeseed in the no - tillage cotton - rapeseed system. The aim was to study the effects of nitrogen （N） ,phosphorus （P） and potassium （K） fertilization on yield, economic benefit and optimal rates of fertilizers for rapeseed. The result showed that fertilizers promoted both vegetative and reproductive growth of rapeseed ,which further significantly improved seed yield and profit. It indicated that their effects on yield and profit was ranked as N 〉 P 〉 K. Based on the fertilizer response equations from the trial, the most effective fertilization rates for rapeseed were 205kg N/hm^2 ,76kg P2O5/hm^2 and 35kg K2O/hm^2, respectively.